Electric-storage-battery negative-pole plate.



E. w. SMITH.

ELEOTRIG STORAGE BATTERY NEGATIVE POLE PLATE.

APPLICATION FILED MAY 19, 1905- Patented Feb. 3,

' negative pole plate active changevin the bulk or over 'provements' Negative-Pole Plates,- of which the follow-.-

ED strArns PATEN orr cn.

EDWARD wanron SMITH, or PHILADELPHIA, rnnnsnvn'mn.

SMirH a citizen of the United States, residing at the cityof Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Imin Electric Storage Battery ingis, a specification.

Objects of the invention are to provide negative-pole'plate active material of comparatively great durability; to impart to thereof and without bringing the active mass into a state of compression,

throughout a long life, and to obtain theadvantages which result. from. initially 'complate gridfor its-reception' with active mate- I rial or material to become active of such 1 character that it attains the requisite loose upon the grid or support a forth the invention pletely filling the recesses; boxes ,or cavities which are provided in the; negative pole Figure is an elevational view broken away illustrating a negative pole plate provided with which are initially filled with the novel ,ac-

"sub-division, such as ofthe: novel tive material. Fig. 2, 1s a sectional-view ot a plate diagrammatically illustrating pellets duced to the metallic state. and discharged, and Fig. 3, is a similar "view illustrating the active material after reduction, the bulk has n0t increased'.- v v r Thenegative pole plate active material or material to 'become" active comprises a [mixj ture of nert material in a state of extreme an and very porous lead, or a lead compound which upon reduction produces'yvery porous lead in the sensethat-zitoctupies a comparas tivel large volun'ie'v preportionto Specification of Letters na material without all dimensions the quality of -maintaining its capacity and porosity hereinafter set Y litharge. features and box-like receptacles active materialbefore being re-ftively large volume, so' that tl showing that .the grid; the latter serving vent the mass from f lling impalp able. Powder ntncrnrcsroanen-imrrnny NEGATIVE-POLE PLATE.

v V Patented Fear, 3; 1914; g V Application filed May 19,1905. Serial No.2e1',11s.

W ight. Very finely divided lampflblaclr is an example ofsuch'iner't materlal; and as examples of lead compounds which occupy a comparatively large volume in pro-portionto their weight, and: which uponreduction will produce very porouslead; the following maybe mentioned: Orange mineral, i. 0., roasted lead carbonate; ture of. same with lead -oxid of any: kind.

Lead carbonate or a mix- Hydrated lead oxid or a mixture of same.

uvith lead oxid of any kind.- Thea-product, derlved from lead" subjected to attrition in.

water and to the action of air. Or a mixture of any such compounds." The last mentioned oxidized lead, and i by first producing granular lead, for example, by pouring "melted lead into a jetzof steam, and then placing the result ng granu;

cylinder through which air may be made to circulate so that the particles or granules of lead grind upon themselves While subjected to the action of air and water. As a result the water becomes milky and is drawn off p oduct consists of lead compound or t;;r iay be manufactured 1 lar lead-"along with water into arotating and filtered aaid the residue constitutes a- I product which gives satisfactory results.

The nature of the product may be described .by stating that'its specific, gravity is ap-- proximately; 69 7 5 K I -.of that ofiordinari'y *"RheI'SPeC-ific'graVity of the pro uct-isIa guide in determining how far the p'rocessis to be continued. I f

One to five per cent. by

weight of inert material and 99 to by Weighti of the lead 'or lead compound is a'nillustra or material adapted to ibecome active is' subjectedto electrolytic reduction f anddischarge, tends to grow tion: of proportions "which are; productive": of good results.- .When the described negative pole plate active material it andjbecomeof a more loose structure,- but whatever tendency thereis for Y Y it to grow and become more porous iscompensated for by-reasonbf-its initially relaiere is neither compression of the mass" r apart, and thus a'loose structurei's maintained withoutincrease of bulk Since therejis,

ceptacles a, of

during the "electrolytic procesanojincrease of bulk, the box-like reinitially and remain completely filled with the described negative pole platejactive'ma of loose structure such as can be produced tcrial or material adapted to become active which is obviously advantageous, and since the material 1s not dense enough to be fought into a state of compression there is uo need to employ such a heavy grid as would be-required if the material were dense and had'to be maintained in a state of compression. The receptacles a, may of course be initially completely filled with the described active material prior to its subjection" to electrolytic action, so that they can be completely filled with the described mixture of inert material and lead 'compound which can be'reduced in sz'ta tothe metallicfstate and discharged, or the lead by the expansive action of an admixture of inert material can-be first prepared by elec-' triolysis and then placedin the receptacles, boxes or pockets a, in such away as to initially fill them. Since the pockets are completely filled with a mixture of inert I and described active material and contain no empty space or soluble matter. for producing such space, it follows that thematerial may not grow 1n bulk and-since the mater1al' '1s not dense 1t 1s not brought into a statecf-compression, it therefore always,

is of substantially uniform consistency throughout its mass.

It will be obvious to those skllled 1n the art to which my invention relates that modifications may be made in details ..Witl1out prior state of the art may require, but

der, and a finely divided lead compou d eli, Q

substantially as described.

departing from thespirit thereof, hence the invention is not limited further than 'the- Having thus described the natureand i 1 objects or my invention what I claim as new and desire to secure byLetters Patent 'is- 1; Negative pole plate active material consisting. of a massof non-fibrous inert material capable of expanding ordin lead active material and in a state of reme sub-division like an impalpable rived from the attritionof leadwith water,

substantially as described. 2. A negative pole plate consisting of the combination of a grid having "box-like cavities and a mass completely filling said 50' signed my name. v

j EDWARD WANTON SMITH. Witnesses: 1 p

I XV. 'J'. JAcxsoN,

K. M. GILLIGAN.

In witness. whereof I have hereunto 

